Trezor released a new feature that allows users to test the seed backup through the trezor wallet user interface. The seed is the 12 or 24 unique words you need to safely store and which are used to deterministically generate all private keys in HD Wallets. Quote:
Starting today, you can rest easy, without necessarily needing to wipe and launch the setup process all over again. In the TREZOR Wallet user interface, just go to device settings by clicking on your device name, and then select Advanced > Check recovery seed. Follow the instructions and, in the end, the device will tell you the status of your recovery seed. Then, you can be confident that your seed is correct, or you will know for sure you need to generate a new one.